/**
 * Software License, Version 1.0
 *
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 *
 *
 *Redistribution and use in source and binary forms, with or without
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For
 * further information contact the Community Grids Lab at
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and
 * wherever such third-party acknowledgments normally appear.
 *
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering,
 * shall not be used to endorse or promote products derived from this software
 * without prior written permission from Indiana University.  For written
 * permission, please contact the Advanced Research and Technology Institute
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering,
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 *
 *
 * Indiana University provides no reassurances that the source code provided
 * does not infringe the patent or any other intellectual property rights of
 * any other entity.  Indiana University disclaims any liability to any
 * recipient for claims brought by any other entity based on infringement of
 * intellectual property rights or otherwise.
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS.
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS",
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION
 *GENERATED USING SOFTWARE.
 */

package cgl.narada.service.timer;

/**
 * Implementation of ClockI abstract class for Linux and Solaris machines.
 * 
 * @author Hasan Bulut - hbulut@indiana.edu Community Grids Lab., Indiana
 *         University
 * @version 1.0
 */
public class UnixClock extends ClockI {
    // ~ Static fields/initializers
    // -----------------------------------------------

    private String libPath = "/ext/unix/liblinuxclock.so";
    private static UnixClock instance = new UnixClock();

    // ~ Instance fields
    // ----------------------------------------------------------

    // ~ Constructors
    // -------------------------------------------------------------

    /**
     * Generates a new UnixClock object.
     */
    private UnixClock() {
        // String temp = globalServiceProperties.getProperty("NB_HOME");
        //
        // if (temp != null) {
        // NB_HOME = temp;
        // }

        String NB_HOME = HRClock.getNBHome();
        
        System.out.println("NB_HOME : " + NB_HOME);
        // get absolute library path from properties class
        OSName = System.getProperty("os.name");
        if (OSName.toLowerCase().indexOf("linux") >= 0) {
            libPath = NB_HOME + "/ext/linux/liblinuxclock.so";
        } else if (OSName.toLowerCase().indexOf("sunos") >= 0) {
            libPath = NB_HOME + "/ext/unix/libsolarisclock.so";
        }
        System.out.println("libPath:" + libPath);
        System.load(libPath);
        // */
    }

    // ~ Methods
    // ------------------------------------------------------------------

    /**
     * Returns clock implementation for Linux and Solaris machines.
     * 
     * @return ClockI - interface that has been implemented.
     */
    public static ClockI getClock() {
        return instance;
    }

    /**
     * Returns time in microseconds
     * 
     * @return long - local time as microseconds
     */
    public native long getLocalMicroseconds();

    /**
     * Makes a call to native side to get local clock time as milliseconds
     * 
     * @return long - time as milliseconds
     */
    public native long getLocalMilliseconds();

    /**
     * Makes a call to native side to causes thread to sleep for the specified
     * amount in milliseconds.
     * 
     * @param sleepVal -
     *            sleep time in milliseconds
     */
    public native void sleep(int sleepVal);

    /**
     * Makes a call to native side to get local clock time as microseconds
     * 
     * @return long - time as microseconds
     */
    public long getTimeMicroseconds() {
        return getLocalMicroseconds();
    }

    /**
     * Returns time in milliseconds
     * 
     * @return long - time as milliseconds
     */
    public long getTimeMilliseconds() {
        return getLocalMilliseconds();
    }

    /**
     * Simple test program.
     * 
     * @param args -
     *            input arguments, no arguments used.
     */
    public static void main(String[] args) {
        ClockI lnxtmr = UnixClock.getClock();
        long tmsec = 0;
        long tusec = 0;
        tmsec = lnxtmr.getTimeMilliseconds();
        lnxtmr.sleep(1000);
        tusec = lnxtmr.getTimeMicroseconds();
        System.out.println("msec:" + tmsec);
        System.out.println("usec:" + tusec);
    }
}
